Started to restore clusters based recommendation engine

src/libs/database/impl/Artist.cpp

@@ -104,6 +104,21 @@ Artist::getAllOrphans(Session& session)
 	return std::vector<pointer>(res.begin(), res.end());
 }
 
+std::vector<IdType>
+Artist::getAllIdsWithClusters(Session& session, std::optional<std::size_t> limit)
+{
+	session.checkSharedLocked();
+
+	Wt::Dbo::collection<IdType> res = session.getDboSession().query<IdType>
+		("SELECT DISTINCT a.id FROM artist a"
+		 	" INNER JOIN track t ON t.id = t_a_l.track_id INNER JOIN track_artist_link t_a_l ON t_a_l.artist_id = a.id"
+		 	" INNER JOIN track_cluster t_c ON t_c.track_id = t.id")
+		.limit(limit ? static_cast<int>(*limit) : -1);
+
+	return std::vector<IdType>(res.begin(), res.end());
+}
+
+
 static
 Wt::Dbo::Query<Artist::pointer>
 getQuery(Session& session,

src/libs/database/impl/Release.cpp

@@ -252,6 +252,21 @@ Release::getByFilter(Session& session,
 	return res;
 }
 
+std::vector<IdType>
+Release::getAllIdsWithClusters(Session& session, std::optional<std::size_t> limit)
+{
+	session.checkSharedLocked();
+
+	Wt::Dbo::collection<IdType> res = session.getDboSession().query<IdType>
+		("SELECT DISTINCT r.id FROM release r"
+		 	" INNER JOIN track t ON t.release_id = r.id"
+		 	" INNER JOIN track_cluster t_c ON t_c.track_id = t.id")
+		.limit(limit ? static_cast<int>(*limit) : -1);
+
+	return std::vector<IdType>(res.begin(), res.end());
+}
+
+
 std::optional<std::size_t>
 Release::getTotalTrackNumber(void) const
 {

src/libs/database/impl/Session.cpp

@@ -118,7 +118,7 @@ Session::doDatabaseMigrationIfNeeded()
 		{
 			_session.execute("DROP TABLE similarity_settings");
 			_session.execute("DROP TABLE similarity_settings_feature");
-			_session.execute("ALTER TABLE scan_settings ADD similarity_engine_type INTEGER NOT NULL DEFAULT(" + std::to_string(static_cast<int>(ScanSettings::SimilarityEngineType::Clusters)) + ")");
+			_session.execute("ALTER TABLE scan_settings ADD similarity_engine_type INTEGER NOT NULL DEFAULT(" + std::to_string(static_cast<int>(ScanSettings::RecommendationEngineType::Clusters)) + ")");
 		}
 		else if (version == 8)
 		{

src/libs/database/impl/Track.cpp

@@ -163,6 +163,19 @@ Track::getAllIdsWithFeatures(Session& session, std::optional<std::size_t> limit)
 	return std::vector<IdType>(res.begin(), res.end());
 }
 
+std::vector<IdType>
+Track::getAllIdsWithClusters(Session& session, std::optional<std::size_t> limit)
+{
+	session.checkSharedLocked();
+
+	Wt::Dbo::collection<IdType> res = session.getDboSession().query<IdType>
+		("SELECT DISTINCT t.id FROM track t"
+		 	" INNER JOIN track_cluster t_c ON t_c.track_id = t.id")
+		.limit(limit ? static_cast<int>(*limit) : -1);
+
+	return std::vector<IdType>(res.begin(), res.end());
+}
+
 std::vector<Cluster::pointer>
 Track::getClusters(void) const
 {
@@ -263,7 +276,7 @@ Track::getByFilter(Session& session,
 
 std::vector<Track::pointer>
 Track::getSimilarTracks(Session& session,
-				const std::set<IdType>& tracks,
+				const std::unordered_set<IdType>& tracks,
 				std::optional<std::size_t> offset,
 				std::optional<std::size_t> size)
 {